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    Reproducing signal measuring method, signal reproducing apparatus, and optical recording medium
    13.
    发明公开
    Reproducing signal measuring method, signal reproducing apparatus, and optical recording medium 有权
    Wiedergabesignalmessverfahren，Signalwiedergabevorrichtung

    公开(公告)号：EP2026341A1

    公开(公告)日：2009-02-18

    申请号：EP08014160.9

    申请日：2008-08-07

    申请人： Hitachi Ltd.

    发明人： Hirotsune, Akemi ,  Ushiyama, Junko ,  Minemura, Hiroyuki ,  Kurokawa, Takahiro ,  Miyamoto, Harukazu

    IPC分类号： G11B7/005 ,  G11B20/14 ,  G11B7/24

    CPC分类号： G11B7/005 ,  G11B7/24038 ,  G11B20/1217 ,  G11B20/22 ,  G11B2007/0013 ,  G11B2020/1298 ,  G11B2220/235 ,  G11B2220/2537

    摘要： Regarding a signal recorded with a first frequency in a recording area on a specific first recording layer (1203) and a signal recorded with a second frequency different from the first frequency in a recording area on a second recording layer (1204) which might cause interlayer crosstalk in relation to the first recording layer (1203), a reproducing signal measurement method for a multilayer optical recording medium having at least three recording layers (101,102,103,104,105,106) includes reproducing the signal recorded in the recording area on the first recording layer (S1103), separating signals recorded respectively with the first and second frequencies (S1104), discriminating signal amplitude of the first frequency and a maximum value in signal amplitude of the second frequency (S1105), and calculating a signal amplitude ratio between them to measure interlayer crosstalk contained in the signal reproduced from the recording area on the first recording layer (S1106). Thus, the interlayer crosstalk quantity caused by unnecessary light can be measured quantitatively.

    摘要翻译： 关于在特定第一记录层（1203）上的记录区域中以第一频率记录的信号和在第二记录层（1204）上的记录区域中记录有与第一频率不同的第二频率的信号，可能导致中间层 与第一记录层（1203）相关的串扰，具有至少三个记录层（101,102,103,104,105,106）的多层光学记录介质的再现信号测量方法包括再现记录在第一记录层上的记录区域中的信号（S1103） 分离分别以第一和第二频率记录的信号（S1104），识别第一频率的信号幅度和第二频率的信号幅度中的最大值（S1105），并计算它们之间的信号幅度比以测量包含在 从第一记录层上的记录区再现的信号（S1106）。 因此，可以定量地测量由不必要的光引起的层间串扰量。